The financially motivated threat cluster UNC3753 is conducting a fast-paced data theft and extortion campaign against US legal and professional services. The group leverages vishing and IT helpdesk impersonation to trick targets into installing legitimate RMM and screen-sharing tools, enabling rapid data exfiltration from corporate repositories and VDI environments. Notably, the campaign also involves suspected physical intrusions where actors use USB media to steal data directly from endpoints.
UNC6671, operating under the BlackFile brand, conducts sophisticated vishing and Adversary-in-the-Middle (AiTM) attacks to bypass MFA and compromise SSO platforms like Microsoft 365 and Okta. Once inside, the group uses automated Python and PowerShell scripts to rapidly exfiltrate sensitive data via APIs, often masking their activity as routine file access events, before launching aggressive extortion campaigns.
Mandiant's M-Trends 2026 report highlights a severe divergence in adversary tactics. Cybercriminals are optimizing for speed, with initial access hand-offs collapsing to 22 seconds, and focusing on recovery denial by targeting hypervisors and backup infrastructure. Conversely, espionage groups are prioritizing extreme persistence by exploiting zero-days and deploying in-memory malware on unmonitored edge devices, while voice phishing has emerged as a primary vector for bypassing MFA and compromising SaaS environments.
AI Rush Opens New Attack Paths as Trusted Cloud Services Fuel Phishing
The rush to adopt artificial intelligence is giving attackers two new advantages: convincing lures to trick users and poorly secured infrastructure to exploit. This week, multiple campaigns used fake websites for the Claude AI assistant to infect victims with password-stealing malware, while researchers revealed that commercial robots and AI connection protocols contain critical flaws that let hackers hijack them. Because organizations are deploying AI tools faster than they can secure them, attackers are finding easy entry points into corporate networks.
In parallel, phishing campaigns are increasingly hijacking trusted cloud services like Amazon's email platform and Vercel's AI-powered website builder to send messages that bypass security filters entirely. A massive campaign targeting US employees used fake HR reviews to steal login sessions even when multi-factor authentication was enabled, and the breach of the Canvas learning platform exposed data on 275 million people that can now be used for highly convincing follow-up scams. These trends together suggest that traditional defenses are losing effectiveness because attackers are hiding inside the systems we already trust.
Organizations should immediately patch the actively exploited Palo Alto Networks and Ivanti vulnerabilities flagged by CISA this week, require phishing-resistant authentication methods, and treat every AI tool and robot connected to their network as a high-risk device that needs strict monitoring.
